package com.yilin.reggie.controller;

import com.yilin.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.http.HttpResponse;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class commonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){

        //原始文件名字
        String originalFilename = file.getOriginalFilename();
        //截取后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名字，防止文件名重复
        String fileName = UUID.randomUUID().toString()+suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        if(!dir.exists()){
            //如果目录不存在,创建目录
            dir.mkdirs();
        }

        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws Exception {
        //输入流，读取文件内容
        FileInputStream fileInputStream=new FileInputStream(new File(basePath+name));
        //输出流，显示图片
        ServletOutputStream outputStream=response.getOutputStream();

        response.setContentType("image/jpeg");

        int len=0;
        byte[] bytes=new byte[1024];
        while ((len= fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }
        fileInputStream.close();
        outputStream.close();
    }
}
